12209987 has 4 divisors (see below), whose sum is σ = 12740880. Its totient is φ = 11679096.

The previous prime is 12209971. The next prime is 12209993. The reversal of 12209987 is 78990221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78990221 = 47 ⋅1680643.

It is a cyclic number.

It is not a de Polignac number, because 12209987 - 2⁴ = 12209971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12209987.

It is not an unprimeable number, because it can be changed into a prime (12209947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265412 + ... + 265457.

It is an arithmetic number, because the mean of its divisors is an integer number (3185220).

Almost surely, 2^12209987 is an apocalyptic number.

12209987 is a deficient number, since it is larger than the sum of its proper divisors (530893).

12209987 is an equidigital number, since it uses as much as digits as its factorization.

12209987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530892.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 12209987 is about 3494.2791817484. The cubic root of 12209987 is about 230.2705511885.

The spelling of 12209987 in words is "twelve million, two hundred nine thousand, nine hundred eighty-seven".